<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Tree Component</title>
    <style>
        body {
            background-color: #000;
            font-family: Arial, sans-serif;
        }
        .tree {
            list-style-type: none;
            padding-left: 20px;
        }
        .tree-item {
            margin: 10px 0;
            position: relative;
        }
        .tree-item::before {
            content: "";
            position: absolute;
            top: 10px;
            left: -20px;
            border-left: 2px solid #1cd0e0;
            height: 100%;
        }
        .tree-item::after {
            content: "";
            position: absolute;
            top: 10px;
            left: -20px;
            border-top: 2px solid #1cd0e0;
            width: 20px;
        }
        .label {
            display: inline-block;
            background-color: rgba(0, 0, 0, 0.6);
            color: #1cd0e0;
            padding: 5px 10px;
            border-radius: 5px;
        }
    </style>
</head>
<body>
    <ul class="tree">
        <li class="tree-item">
            <span class="label">周边查询</span>
            <ul class="tree">
                <li class="tree-item">
                    <span class="label">路径规划</span>
                </li>
                <li class="tree-item">
                    <span class="label">站点设施</span>
                </li>
            </ul>
        </li>
    </ul>
</body>
</html>
